Re: 4-band Controller – don t work

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the button on the back is for choosing between the A B C frequencies… A is the only one that should work i think, with the older Bits anyway

Nope, not quite.
The a,b,c switch on the back is for the different types of cars, standards and boosters.
a – standard single speed cars
b – booster car, push top button to go on boost
c – booster car, on boost all the time.

The range on my 4B was crap too, until I changed the aerial to a telescopic, now I dont use anything else.